Formulation of a reduced order model for the stiffness on elastohydrodynamic line contacts applied to cam-follower mechanism

Tsuha, Natália Akemi Hoshikawa; Nonato, Fábio; Cavalca, Kátia Lucchesi

doi:10.1016/j.mechmachtheory.2017.03.002

Cited by 23 publications

(4 citation statements)

References 22 publications

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“…In addition, computer-aided tool [22] have been developed to predict the relevant physical and mechanical properties of metal material. Tsuha et al proposed an approach for boundary layer representation of elastohydrodynamic (EHD) lubricated contact studies as a function of EHD stiffness parameters, the emphasis has been focused on the prediction of EHD pressure and film thickness [23]. Kumar et al developed statistical modeling to predict the tribological behavior of ZA/ZrB2 in situ composites [24].…”

Section: Introductionmentioning

confidence: 99%

Research on self-healing characteristic and state prediction method of the copper based powder metallurgy materials on friction interface

Wu,

Yang,

Shu

et al. 2024

Surf. Topogr.: Metrol. Prop.

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In high power density transmission systems, the friction and wear characteristic of copper based powder metallurgy materials is directly linked to working reliability. Moreover, these materials have frictional self-healing characteristic at the material interface. This paper focuses on exploring the healing mechanism of copper based powder metallurgy materials and conducts "damage-healing" tests, proposing a method to characterize the self-healing characteristic. Subsequently, through comparative tests, the influence of temperature, speed, and pressure on the self-healing characteristics is analyzed. The results show that the increase in temperature reduces the furrow width and depth by 15.30% and 59.76%, respectively. Pressure has the greatest effect on surface roughness, reducing it by 67%. Meanwhile, this paper developed a PSO (Particle Swarm Optimization)-LSTM (Long Short-Term Memory) method to accurately predict the self-healing characterization parameters and self-healing time with small error (average 4.35 %) and high correlation coefficient (R2) (average 0.976). This study contributes to the development of interface repair technology for friction materials.

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Section: Introductionmentioning

confidence: 99%

Research on self-healing characteristic and state prediction method of the copper based powder metallurgy materials on friction interface

Wu,

Yang,

Shu

et al. 2024

Surf. Topogr.: Metrol. Prop.

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“…Tsuha et al, [6] propose an approach for the representation of the contact boundary layer studies with EHL according to the rigidity parameters, applying it in a follower cam system, obtaining the evaluation of EHL for the different speeds. Nikas [7] analyzed analytically the effects of traction on the normal displacements for numerical tests in an elliptical contact with EHL comparing with known published formulas.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Elastohydrodynamic Lubrication in Spur Gears

Rafael Ramirez,

Andrés Rodríguez,

Jonathan Fabregas

et al. 2024

CFDL

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An analysis using computational modeling by finite elements of the phenomenon of elastohydrodynamic lubrication (EHL) was carried out for a transmission system of pinion gear in a crankcase with partial filling lubrication. The analysis utilized tribological studies describing the contact behavior characteristics of solid surfaces with the lubrication film caused by dragging and splashing. Furthermore, the characteristics of the Reynolds-Hertz model for this type of phenomena are described, as well as the equations of elastic deformation and elastic displacements along with the geometry of the non-concordant bodies in contact. This was done by modeling the Lagrangian-Eulerian type for non-Newtonian fluid, implementing multiphysics coupling methods. The pressure profile of the lubricant films, the temperature reached by the lubricant, and the von Mises stress at the contact were obtained, showing a good approximation with the related results, indicating a range of 30 MPa to 900 MPa of pressure in the lubricant film and von Mises stress ranging from 30 MPa to 100 MPa in the contact area of the gear tooth.

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“…Based on these findings, the authors provided recommendations for the optimization of the cam-tappet mechanism in general. A reduced-order model for the calculation of the elastohydrodynamic lubricated (EHL) line contact was developed by TSUHA [28] in order to speed up the prediction of the most important output variables, such as the minimum lubrication gap height and pressure at the central point of the contact. For the cam-roller follower contact, a FEM-based approach was developed by SHIRZADEGAN [29], which also, in contrast to most works, not only describes the central line contact but also considers edge effects in the axial cam direction.…”

Section: Introductionmentioning

confidence: 99%

Understanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects

Orgeldinger

Tremmel

2021

Lubricants

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With the increasing challenges of climate change and scarce resources, the development of sustainable and energy-efficient technical systems is becoming increasingly important. In many applications, the friction losses occurring in contacts have a decisive influence on the overall efficiency. At this point, tribological contact optimization can make an important contribution to increasing the efficiency of technical systems. However, improvements are often associated with a considerable experimental effort. To reduce the development time, additional simulation models can be applied to predict the tribological behavior. This requires the closest possible approximation of the real contact within a numerical model. This paper presents a simulation approach for the time-dependent simulation of a cam–tappet contact. The simulation uses realistic operating conditions as they arise in the valve train of internal combustion engines. The influence of edge effects on the friction behavior is considered by a scaled calculation area and the influence of the surface roughness is investigated using stochastic asperity models. It is shown that the tribological behavior within the contact strongly depends on the surface properties and the load spectrum used. In addition, edge effects on the sides of the contact area have a clear influence on the pressure and film thickness distribution.

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Formulation of a reduced order model for the stiffness on elastohydrodynamic line contacts applied to cam-follower mechanism

Cited by 23 publications

References 22 publications

Research on self-healing characteristic and state prediction method of the copper based powder metallurgy materials on friction interface

Research on self-healing characteristic and state prediction method of the copper based powder metallurgy materials on friction interface

Modeling and Simulation of Elastohydrodynamic Lubrication in Spur Gears

Understanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects

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